THE SKIN. 109 



Laboratory exercise No. 32. The skin. Harden portions of the scalp 

 and palm of the hand in alcohol, embed in paraffin, and stain with 

 haematoxylin and eosin, method No. 8. Make a study of the structures 

 described above, noting 1 especially the stratum corneum, stratum luci- 

 dum, stratum granulosum, and stratum Malpigiiii of the epidermis. 

 Observe the membrana propria which forms a supporting- base for the 

 squamous cells. Note the difference in form of the cells of the different 

 layers. In the corium, observe the conical elevations, or papillae, and 

 the hair follicles which extend into its structures. The corium is made 

 up chiefly of connective tissue filled with blood-vessels and nerves. In 

 the subcutaneous tissue, search for sweat glands and trace the excre- 

 tory duct to the surface. Make a study of the hair, both T.S. and L.S., 

 and demonstrate the shaft, root, bulb, papilla, hair follicle, cuticle, cor- 

 tex, and medulla. Drawing's. 



MEMORANDA. 



